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url: /v6.2/en-us/repetition.md
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# Duplicate

Duplicate calculations support date dimensions and non-date dimensions.
There are two types of calculation methods for duplicate calculations:

* By Condition
* By Count

There are two types of calculation results for duplicate calculations:

* Duplicate Count
* Duplicate Rate

Duplicate calculations support specifying time fields and time filtering conditions to calculate the number of repetitions/repetition rates for specific times.
![](/images/chart/calculation/repetition-001.png)

## By Condition

The number of measures that meet the repetition condition will be counted for all measures under the dimension.
![](/images/chart/calculation/repetition-002.png)

## By Count

The count will tally the number of repetitions of the measure under this dimension. If a measure appears only once, the repetition count is 0; if it appears twice, the repetition count is 2.
![](/images/chart/calculation/repetition-003.png)

### Example of Duplicate Count

![](/images/chart/calculation/repetition-004.png)

### Example of Repetition Rate

![](/images/chart/calculation/repetition-005.png)

## Time Filter

Calculate the number of repetitions/repetition rate at a specific time.
![](/images/chart/calculation/repetition-006.png)